As an endurance athlete, I spend less time in the gym than power lifters and body builders. I concentrate on major muscle groups and core strength. I have used Pro Blend 55 for over 10 years and have always liked the results it gives me. It mixes easily and tastes very good, whether mixed in water, milk or juice. I can notice a difference in my muscle gain if I stop using it for a while. Once I resume, my strength improvements accelerate. I believe that its extra BCAA content helps prevent muscle breakdown during long running and cycling efforts.